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With the sporting event just 250 days away, the Invictus Games Sydney 2018 ambassador Curtis McGrath has helped launch the Make Your Mark Down Under campaign, urging the community to get involved whether it be volunteering, fundraising or helping raise awareness for the upcoming games.

"No matter where you are or what you do, there is a role for you in the Invictus Games Sydney 2018. This is a moment in time for us to all come together as a nation and actively demonstrate our support for our defence community," Curtis, who had both of his legs amputated after stepping on an explosive while serving in the Australian Army in Afghanistan, explained of the initiate.

WATCH: Why Invictus is so important to Prince Harry. Post continues after the video...

"We're calling on all Australians to embrace this call to action and 'Make Your Mark'. Set yourself a goal, whether big or small, to do something tangible in your community and let our wounded warriors know we're behind them," the recently retired veteran added.

Leading by example, over the weekend Curtis hosted a 500-strong group on a "Walk and Talk" tour around Sydney Olympic Park.

Former military man Prince Harry launched the Paralympics-style event for wounded servicemen and women back in 2014 and it has since become a global attraction.

Prince Harry is bringing the Invictus Games Down Under in October.

After visiting the Warrior Games in Colorado in 2013, Harry had a light-bulb moment and realised sport was the key in helping heal the ravages of war.

"Sport is what would make the difference. Sport would help these guys and girls fix their lives. I left Colorado with a determination to take this to an international audience," the royal revealed during the launch event in Sydney last year.

"I know that people across the country – from Perth to Sydney, from Darwin to Adelaide – will embrace the Invictus Games and show their support for competitors from their local towns and right across the country. I have no doubt that the Sydney public will make these games their own," he added.

The Invictus Games will be hosted in Sydney from the 20th to the 27th of October.